build_gitbook.js

const fs = require('fs');
const path = require('path');

const baseDir = __dirname;
const historyData = JSON.parse(fs.readFileSync(path.join(baseDir, 'history_data.json'), 'utf8'));

// Generate SUMMARY.md
let summaryMd = `# Summary\n\n`;
summaryMd += `* [前言与电子书简介](README.md)\n\n`;
summaryMd += `## 巴菲特致股东信历年全集 (1965-2024)\n\n`;

for (let y = 1965; y <= 2024; y++) {
  summaryMd += `* [${y}年股东信：背景、要点与原文中英对照](${y}/README.md)\n`;
}

fs.writeFileSync(path.join(baseDir, 'SUMMARY.md'), summaryMd, 'utf8');

// Generate pages
for (let y = 1965; y <= 2024; y++) {
  const origPath = path.join(baseDir, y.toString(), `${y}_Shareholder_Letter.md`);
  if (!fs.existsSync(origPath)) continue;

  const rawContent = fs.readFileSync(origPath, 'utf8');
  const info = historyData[y] || {};
  const stats = info.marketStats || {};

  let md = `# ${y}年巴菲特致股东信（含背景与要点总结）\n\n`;

  // Prefer SVG or JPG infographic image for every year
  const svgPath = path.join(baseDir, 'images', `${y}.svg`);
  const jpgPath = path.join(baseDir, 'images', `${y}.jpg`);

  if (fs.existsSync(svgPath)) {
    md += `![${y}年巴菲特股东信中文图解看板](../images/${y}.svg)\n\n`;
  } else if (fs.existsSync(jpgPath)) {
    md += `![${y}年巴菲特股东信中文图解看板](../images/${y}.jpg)\n\n`;
  }

  md += `## 📜 一、${y}年股东信背景与历史脉络\n\n`;
  
  // Market Indices Stats Table
  md += `### 📊 1. 当年美股三大指数表现\n`;
  md += `| 大盘指数 | 全年真实涨跌幅 |\n`;
  md += `| :--- | :--- |\n`;
  md += `| **道琼斯工业平均指数 (DJIA)** | **${stats.djia || 'N/A'}** |\n`;
  md += `| **标普500指数 (S&P 500)** | **${stats.sp500 || 'N/A'}** |\n`;
  md += `| **纳斯达克指数 (NASDAQ)** | **${stats.nasdaq || 'N/A'}** |\n\n`;

  // Dow Jones Full 30 Components
  if (stats.dowComponents) {
    md += `<details>\n<summary><b>🔍 点此展开查看当年【道琼斯工业平均指数】全量成分股名单 (30公司)</b></summary>\n\n`;
    md += `> ${stats.dowComponents}\n\n`;
    md += `</details>\n\n`;
  }

  // Top 5 Sectors & Stocks
  if (stats.topSectorsDetailed && stats.topSectorsDetailed.length > 0) {
    md += `### 🏆 2. 当年全市场表现 Top 5 行业与热门领涨股票（含真实涨跌幅）\n`;
    md += `* **表现最佳 Top 5 行业/板块及涨幅**：${stats.topSectorsDetailed.join('、')}\n`;
    if (stats.topStocksDetailed && stats.topStocksDetailed.length > 0) {
      md += `* **表现最佳 Top 5 领涨股票及具体涨幅**：${stats.topStocksDetailed.join('、')}\n`;
    }
    md += `\n`;
  }

  md += `### 3. 宏观与资本市场环境\n${info.market || ''}\n\n`;
  md += `### 4. 伯克希尔·哈撒韦公司动态\n${info.berkshire || ''}\n\n`;
  md += `### 5. 当年重大历史事件与新闻\n${info.news || ''}\n\n`;

  // Section 2: Key Takeaways
  md += `## 💡 二、${y}年股东信核心要点与投资思想影响\n\n`;
  (info.takeaways || []).forEach((item, idx) => {
    md += `**${idx + 1}. ${item}**\n\n`;
  });
  md += `---\n\n`;

  // Section 3: Original Content
  md += `## 📄 三、${y}年致股东信原文与中文对照\n\n`;
  md += rawContent;

  const targetPath = path.join(baseDir, y.toString(), 'README.md');
  fs.writeFileSync(targetPath, md, 'utf8');
}

console.log('Successfully updated all 60 year pages with 100% SVG/JPG visual infographics!');